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HTTP 428 Precondition Required响应状态码指示服务器要求有条件的请求。

通常，这意味着所需的先决条件头，如If-Match，缺少。

当前提条件头与服务器端状态不匹配时，响应应该是412 Precondition Failed。

状态

428 Precondition Required

规范

规范	标题
RFC 6585，第3节：428先决条件要求	其他HTTP状态码

也可以看看

HTTP 条件请求

If-Match

412

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